Last Friday at Imperial College Business School in London, a throng of MBA students huddled around professor Njuguna Ndung’u, the former governor of the Central Bank of Kenya. Njuguna had been waxing lyrical on the simple technology behind a mobile phone that has revolutionized access to finance in the developing nation. But the MBAs might look a little closer to home. “London is soon expected to become the hub of global fintech,” said professor Andrei Kirilenko, director of Imperial’s Center for Global Finance and Technology. As digital technology redefines financial services, business school students are keen to explore start-ups which are at the forefront of the fintech wave. As an example Ismail Ahmed is CEO and founder of WorldRemit, a London cash transfers start-up valued at $500 million. “WorldRemit owes…